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U.S. users can now choose options such as "transgender" and "intersex"

The move was hailed by LGBT advocacy groups

You don't have to be strictly a man or a woman on Facebook anymore.

In a nod to the "it's complicated" sexual identities of many of its users, the social network on Thursday added a third "custom" gender option for people's profiles. In addition to Male or Female, Facebook now lets U.S. users choose among some 50 additional options such as "transgender," "cisgender," "gender fluid," "intersex" and "neither."

Users also now have the ability to choose the pronoun they'd like to be referred to publicly: he/his, she/her, or the gender-neutral they/their.

"An important part of this is the expression of gender, especially when it extends beyond the definitions of just 'male' or 'female,' " the post continued. "So today, we're proud to offer a new custom gender option to help you better express your own identity on Facebook."

Facebook said it worked with a group of leading lesbian, gay, bisexual and transgender advocacy organizations to come up with the new gender categories.

"Facebook users from across the country have been asking for the ability to reflect their gender accurately, and today Facebook showed they have been listening," said Allison Palmer, a former GLAAD vice president, who worked on the project with Facebook.